diff --git a/winsup/cygwin/fhandler_proc.cc b/winsup/cygwin/fhandler_proc.cc
index 03ec621f4..f1bc1c740 100644
--- a/winsup/cygwin/fhandler_proc.cc
+++ b/winsup/cygwin/fhandler_proc.cc
@@ -1262,6 +1262,7 @@ format_proc_cpuinfo (void *, char *&destbuf)
 /*	  ftcprint (features1, 14, "ibrs" ); */	    /* ind br restricted spec */
 /*	  ftcprint (features1, 15, "stibp"); */	    /* 1 thread ind br pred */
 /*	  ftcprint (features1, 17, "stibp_always_on"); */ /* stibp always on */
+	  ftcprint (features1, 23, "amd_ppin");     /* protected proc id no */
 /*	  ftcprint (features1, 24, "ssbd"); */	    /* spec store byp dis */
 	  ftcprint (features1, 25, "virt_ssbd");    /* vir spec store byp dis */
 /*	  ftcprint (features1, 26, "ssb_no"); */    /* ssb fixed in hardware */